You can use Windows 10/11 indefinitely without a key. You will only face minor cosmetic limitations (like a watermark and the inability to change your wallpaper through settings).
: Often relies on KMS (Key Management Service) hacks or scripts that modify system files to fool the OS into appearing activated. Microsoft Support Risks and Safety Windows 10 Digital Activation 1.5.5.4 -x32 x64-...
This specific version (1.5.5.4) typically uses the HWID (Hardware ID) method. It tricks Microsoft’s servers into thinking your specific hardware has a legitimate digital license. Once "activated," the license usually persists even if you reinstall Windows. You can use Windows 10/11 indefinitely without a key